<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Divi\Design;

use LIT\MCP\Integrations\Divi\BlockTree\Block;
use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
use LIT\MCP\Integrations\Divi\BlockTree\Parser;
use LIT\MCP\Integrations\Divi\Design\AssignRewrite;
use LIT\MCP\Integrations\Divi\Design\PresetAssignment;
use LIT\MCP\Integrations\Divi\Design\PresetBook;
use LogicException;
use PHPUnit\Framework\TestCase;

final class AssignRewriteTest extends TestCase
{
    private const BUTTON = ['module' => 'divi/button', 'preset' => 'aaaaaaaaaa'];

    /** PresetBookTest::stored() with settings in "CTA primär" (aaaaaaaaaa): background colour #111111. */
    private static function stored(): array
    {
        $stored = PresetBookTest::stored();
        $stored['module']['divi/button']['items']['aaaaaaaaaa']['attrs'] = [
            'button' => ['decoration' => ['background' => ['desktop' => ['value' => ['color' => '#111111']]]]],
        ];

        return $stored;
    }

    private static function assignment(): PresetAssignment
    {
        return new PresetAssignment(
            static fn (): PresetBook => PresetBook::fromDivi(self::stored()),
            static fn (string $module): array => $module === 'divi/text'
                ? ['content.decoration.bodyFont' => 'divi/font-body']
                : [],
            static fn (string $id): bool => preg_match('/^[a-z0-9]{10}$/D', $id) === 1
        );
    }

    /** @return NodeIndex Blocks below s0.r0.c0 are m0, m1, … in the order of $inner. */
    private static function index(string $inner): NodeIndex
    {
        return NodeIndex::build((new Parser())->parse(
            '<!-- wp:divi/section --><!-- wp:divi/row --><!-- wp:divi/column -->' . $inner
            . '<!-- /wp:divi/column --><!-- /wp:divi/row --><!-- /wp:divi/section -->'
        ));
    }

    private static function node(NodeIndex $index, string $id): Block
    {
        $block = $index->find('s0.r0.c0.' . $id);
        self::assertNotNull($block);

        return $block;
    }

    public function testAssignsTheStackToBlocksOfTheModuleOnly(): void
    {
        $index = self::index('<!-- wp:divi/button /--><!-- wp:divi/text /-->');
        $rewrite = new AssignRewrite('divi/button', self::assignment(), ['preset' => ['aaaaaaaaaa', 'bbbbbbbbbb']]);

        $button = $rewrite->rewrite(self::node($index, 'm0'));

        self::assertSame(['aaaaaaaaaa', 'bbbbbbbbbb'], $button['modulePreset'] ?? null);
        self::assertNull($rewrite->rewrite(self::node($index, 'm1')), 'another module');
    }

    public function testOnlyWithoutPresetSkipsBlocksWithAnExplicitPreset(): void
    {
        $index = self::index(
            '<!-- wp:divi/button {"modulePreset":["bbbbbbbbbb"]} /-->'
            . '<!-- wp:divi/button /-->'
            . '<!-- wp:divi/button {"modulePreset":["default"]} /-->'
        );
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON, onlyWithoutPreset: true);

        self::assertNull($rewrite->rewrite(self::node($index, 'm0')));
        self::assertSame(['aaaaaaaaaa'], $rewrite->rewrite(self::node($index, 'm1'))['modulePreset'] ?? null);
        self::assertSame(['aaaaaaaaaa'], $rewrite->rewrite(self::node($index, 'm2'))['modulePreset'] ?? null);
    }

    public function testOnlyWithPresetIdReplacesThatPreset(): void
    {
        $index = self::index(
            '<!-- wp:divi/button {"modulePreset":["bbbbbbbbbb"]} /-->'
            . '<!-- wp:divi/button {"modulePreset":["cccccccccc"]} /-->'
            . '<!-- wp:divi/button /-->'
        );
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON, onlyWithPresetId: 'bbbbbbbbbb');

        self::assertSame(['aaaaaaaaaa'], $rewrite->rewrite(self::node($index, 'm0'))['modulePreset'] ?? null);
        self::assertNull($rewrite->rewrite(self::node($index, 'm1')), 'another preset');
        self::assertNull($rewrite->rewrite(self::node($index, 'm2')), 'no preset at all');
    }

    public function testBothFiltersMustHold(): void
    {
        $index = self::index('<!-- wp:divi/button {"modulePreset":["bbbbbbbbbb"]} /-->');
        $rewrite = new AssignRewrite(
            'divi/button',
            self::assignment(),
            self::BUTTON,
            onlyWithoutPreset: true,
            onlyWithPresetId: 'bbbbbbbbbb'
        );

        self::assertNull($rewrite->rewrite(self::node($index, 'm0')));
    }

    public function testRunningAgainChangesNothing(): void
    {
        $index = self::index('<!-- wp:divi/button {"modulePreset":["aaaaaaaaaa"],"x":1} /-->');
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON);

        self::assertNull($rewrite->rewrite(self::node($index, 'm0')));
    }

    public function testGroupPresetsAreAssignedThroughTheKeyOfTheGroup(): void
    {
        $index = self::index('<!-- wp:divi/text /-->');
        $rewrite = new AssignRewrite(
            'divi/text',
            self::assignment(),
            ['group_presets' => ['font-body' => 'Lesetext']]
        );

        $attrs = $rewrite->rewrite(self::node($index, 'm0'));

        self::assertSame(
            ['presetId' => ['gggggggggg'], 'groupName' => 'divi/font-body'],
            $attrs['groupPreset']['content.decoration.bodyFont'] ?? null
        );
        self::assertArrayNotHasKey('modulePreset', $attrs);
    }

    public function testNotesDescribeWhatTheAssignedPresetCovers(): void
    {
        $index = self::index(
            '<!-- wp:divi/button {"button":{"decoration":{"background":{"desktop":{"value":{"color":"#ff0000"}}}}}} /-->'
            . '<!-- wp:divi/button {"button":{"decoration":{"background":{"desktop":{"value":{"color":"#111111"}}}}}} /-->'
        );
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON);

        $different = self::node($index, 'm0');
        $different->setAttrs($rewrite->rewrite($different) ?? []);
        $notes = $rewrite->notes($different, 's0.r0.c0.m0');

        self::assertCount(1, $notes);
        self::assertStringContainsString('s0.r0.c0.m0: lokale Werte überdecken „CTA primär“', $notes[0]);
        self::assertStringContainsString('clear_overrides: true entfernt sie.', $notes[0]);

        $same = self::node($index, 'm1');
        $same->setAttrs($rewrite->rewrite($same) ?? []);
        self::assertSame([], $rewrite->notes($same, 's0.r0.c0.m1'), 'the same value covers nothing');
    }

    public function testClearOverridesRemovesTheCoveredValuesAndHasNoNotes(): void
    {
        $index = self::index(
            '<!-- wp:divi/button {"button":{"decoration":{"background":{"desktop":{"value":{"color":"#ff0000"}}}}}} /-->'
        );
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON, clearOverrides: true);
        $block = self::node($index, 'm0');

        $attrs = $rewrite->rewrite($block);

        self::assertSame(['aaaaaaaaaa'], $attrs['modulePreset'] ?? null);
        self::assertArrayNotHasKey('button', $attrs, 'the local value and its empty parents are gone');
        $block->setAttrs($attrs);
        self::assertSame([], $rewrite->notes($block, 's0.r0.c0.m0'));
    }

    public function testClearOverridesAloneAlsoChangesABlockThatAlreadyHasThePreset(): void
    {
        $index = self::index(
            '<!-- wp:divi/button {"modulePreset":["aaaaaaaaaa"],"button":{"decoration":{"background":'
            . '{"desktop":{"value":{"color":"#ff0000"}}}}}} /-->'
        );
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON, clearOverrides: true);

        $attrs = $rewrite->rewrite(self::node($index, 'm0'));

        self::assertSame(['modulePreset' => ['aaaaaaaaaa']], $attrs);
    }

    public function testAnUnvalidatedSpecIsALogicError(): void
    {
        $index = self::index('<!-- wp:divi/button /-->');
        $rewrite = new AssignRewrite('divi/button', self::assignment(), ['preset' => 'Gibt es nicht']);

        $this->expectException(LogicException::class);

        $rewrite->rewrite(self::node($index, 'm0'));
    }

    public function testGlobalInstancesOfTheModuleConcernTheRewrite(): void
    {
        $index = self::index(
            '<!-- wp:divi/global-layout {"globalModule":"1058","blockName":"divi/button"} /-->'
            . '<!-- wp:divi/global-layout {"globalModule":"1059","blockName":"divi/text"} /-->'
        );
        $rewrite = new AssignRewrite('divi/button', self::assignment(), self::BUTTON);

        self::assertTrue($rewrite->concernsInstance(self::node($index, 'g0')));
        self::assertFalse($rewrite->concernsInstance(self::node($index, 'g1')));
    }
}